Electric signaling system.



J. G; NOLEN &'J. E. SHEPHERD. .ELBGTRIG SIGNALING SYSTEM.- AIYPLIOATIQN FILED MAY 2,1908. 998,299, Patented July 18, '1911.

2 SEEETS-SHEBT 1.

4 msimmww J. G. NOLEN & J., E. SHEPHERD.

ELEGTRIG SIGNALING SYSTEM. 7 APPLICATION FILED MAY 2,1908.

998,299. Patented July 18, 1911..

2 SHEETSSHEET 2.

'ti'cularlyto watch service signal systems, or

iiNrririo s'rar rs PATENT OFFICE.

JAMES o. NOlZIEN. AND JOHN ELDEN sniirnnnn, or CHICAGO, ILLINOIS, AssIGNons.

IBY DIRECT AND MESNE ASSIGNMENTS, PANY, OF NEW YORK, N. Y., A CORPORATION OF MAINE.

TO AUTOMATIC FIRE PROTECTIONTCOM- ELECTRIC sIGNALING sYs'rEM.

Patented July 1s, 1911.

.Application filed May 2, 1908. Serial No. 43Q,457.

fl '0 all whom it may concern: Be it known that we, James G. NOLEN and JOHN E. SHEPHERD, citizens of the United States, both residing atChicago, in the county of Cook and Stat'eof- Illinois,

have invented certain new and useful Improveineiits. in Electric Signaling Systems, of-Which the following is a-s'pecification.

This invention relates to improvements in electric signaling systems, and more parsystems for both Watch service and-fire alarm signaling. V n

Heretofore it. has been customary to pro vide watch signal systems with a-watch mans transmission box at each registry staiLlOiI tlIIOHghOHt his beat or round in the supervised building; and a salient object of our invention is to do away with; the -.multiplicity of boxes thus heretofore required', and to enable a single signaling inst'rumentality such as a telephone or telegraphic signal transmitter, toserve an em tire building or beat Within the building, in

such manner that receipt of a perfect signal from the master "instruineiitality -may indicate perfect performance by the watchmaii in his duties of inspection and registration at different stations. This reduction in the number of signalingboxes is bene ficial beyond the obvious reduction of parts, in thatit minimizes-the number of signals transmitted to thecentral recording station and also reduces to a minimum the number of mainlines required to serve a district. This last mentioned saving results from the necessary and customary practice of definitely limiting the number of boxes which may be connected in a single line circuit,

and obviously the fewer boxes in each biiild-- ing the fewer lines will be necessary to serve a district.

To attain the desired end this invention contemplates the provision of a signal transmitting instrumcntal'ity, a circuit therefor, including a number of circuit closers. at.tlic different watch stations, each manually closable by the watchman. and when all closed conditioning the circuit for the transu'iission of the watchmans signal from the transmitter, and automat c means for operation after each signal transmission, to so d sable I and when thrown selects alternatively, first one other of. the two alternative pathsto serve the circuit as to require resetting of'the equipped with manual switches, which when all thrown one way close one circuit branch, to another position close "t-he'other circuit"branch,'so that only one branch may be closed at a time,- there be ing provided preferably .in. connection with the transmitter an automatic circuit changer, which after each action of the transmitter and then the the transmitter for its neXt signall e specific constructions -and arrangements by which this invention may be prac ticed are many andvaried, but it is presuitable forbotl fire and watch signals, and an object of this invention in one; aspect is to provide for the use of such a single box forb'oth purposes.

Anotherlobject ofthe present invention is .to provide for either ground or naling and to arrange for the transmission of watch signals over the emergency ground w connections for the fire signaling wheels (used only under abnormalconditions) to impose frequent test upon the integrity of such ground'connection.

Other and f'urther objects of the invention will become apparent from the followingvdescription taken in conjunction with thenccompanying drawings, wherein:

Figure 1 is a diagram of an advantageous embodiment of the invention; Fig: 2 is an embodiment thereof in modified form; Fig.

,3 is an embodiment thereof in a telephone system. 7 V

In each embodiment shown of thciuvention we provide a signal transmitting in-.

strumentality, such as a telegraph box or telephone transmitter, connected for signaling operation Q through two alternative supcri'isoi'y circuits, or circuit parts. means for selecting either of=said supervisory circuits to the exclusion of the other for tempo' rarily serving the transmitting instrumentality, and a series of manually operable fe-rredthat' the signal transmitter be one metallic sigswitches controlling the two alternative supervisory circuits each switch being 'arranged to break one of the two alternative circuits when it is in position for-inclusion in the other of said' circuits. The transmitter itself is preferably manually operable to transmit its signal and,preferably, the means for selecting the supervisory circuit to be employed in signaling is asso' ciated with'the transmitter itself, or is otherwise arranged, so that it shifts the service of the transmitter from one of said two supervisory circuits to the other therei of upon each actuation of the transmitter.

Thus it will be seen that after allot the manual switches have been positioned for inclusion in the selected supervisorycircuit which is temporariiy serving the transmitter, operation of the transmitter to send a signal showing such closure of the transmitter-serving circuit, transposes the circuit connections to bring the alternative circuit into transmitterserving relation, so that in order that a sec ond signal may-besentfrom the appropriate signal transmitter it is necessary that each switch be operated to throw it into inclusion in the new transmitter-serving circuit path thus the formerly-established circuit. '30

he must, before turning in his next period cal signal, make the entire round of his beat and throw all of the switches into the. circuit thus newly brought into service relation with the transmitter. '11 urther, it is preferred to provide in the transmitter signaling mechanism which will operate independently of the condition of the supervisory circuits in order that each operation of the transmitter will send a partial signal in the event the watchman has failed to do his duty in making his round and reversing the connections of all of the supervisory switches. Preferably also the slgnahng mechanism which operates independently of the condition of the supervisory circuit,

has both metallic and ground signaling connections, in accordance with approved practice, and preferably the ground connections of such mechanism are so related to the supervisory circuits that either alternate su- .pervisory circuit switches shall be included with the ground connections in establishing the circuit for the transmission ofthe ,watchmans periodical signals. '65.

" Referring to the embodiment} shown in I box,

Fig. 1, 1 indicates in general a transmission comprising a clock-work motor, having a frame 2, and works, not shown, having associated with its various arbors, timed to operate in proper relation, as herein spccified, the signaling wheels and controlling mechanisms, illustrated and to be described.

In such arrangement 3 indicates a pin for receiving a suitable watchmans key, indicated in dotted lines at-l, arranged to engage a winding segment 5 which when partially rotated by the key sufiiciently rotates a pinion G to wind the motoranechanism for a round or cycle of operation, and to bring the trip arm 7, carried by the same arbor, into position to elevate a stop lever 8, which carries adetent O engaging a notch in the periphery of the controlling wheel 10, mounted upon a part of the motor which rotates in unison with the rotation of the signal wheels, For some of the purposes ofthis invention it is preferable that the clockwork transmitter be normally wound sufficiently to occasion a predetermined number of revolutions of the signaling wheels and normally restrained against running down by the engagement of the stop lever detent 9, with the controllingwheel 10, in which event the rotation of pinion G by the segment 5 simply overwinds the clockwork to prepare it to send an additional round of signals. Under such conditions the lifting up the controlling lever. 8 by trip-arm T frees the clock work for signal'- ing transmission, but the clock movement in restoring the trip-arm 7toward its'initial position removes it from contact. with lever 8 and permits the stop 9 to prcssagainst wheel 10, so that as soon as the wheel 10 has completed its single revolution it is stopped by recngagement of the part 5) with the wheel, and so in watch-service operations the clock is never released for the transmission of the plurality of rounds for which it is constantly wound.

For a highly advantageous embodiment of our invention three signaling wheels, 11. 12 andl?) are provided, arranged for rotation in unison, as by arrangement on a single shaft or shafts of equal speed of rotation.

the wheel 11 being provided with a pen '1! normally in contact therewith, and wheels 12- and 13 being provided with respective pens 12' and 13. normally out of contact therewith. The wheel. 11 in the embodiment shown. has its periphery notched to break contact with its pen for the transmission of a number signal. while wheel 12 is provided with teeth in the same relation as the notches of wheel 11. for making contact with pen 12' slightly before the breaking of contact between wheel 11 and pen 11. These wheels correspond with the ordinary metallic and ground circuit wheels of standard fire alarm boxes. The wheel 13, peculiar to the new service contemplated by this invention; "is provided with teeth for some distinguishable number signal, arranged to come into contact with; the pen l3, subsequently to the completion of the signaling p ra on 'll ff rh s e ail?- For controlling the automatic circuit changing operation the box is preferably provided with a switch-control]ing insulated I cam 15, mounted upionian arbor which rotates o'nlyfhalf way to. -eacl'r'tull rotation ofwheels 11, 1 2 and 13, thec am lfibeing arranged for cotiperation with a. selectiveswitch pcnllti,

f to cause it'to contact with one anril17 ex clusively at the end 'of one half revolution of Whee115fand witha-s'ccon'd anvil 17 ex clusiv'ely during the nexthalf-revolution of thewheel. l

Themain line of thje signaling circuit is shown in a form commonly employed in fire alarm signaling, the 'central station' apparatus compris ng ageneratorQO, having its terminal grounded by wire '21, and its positive terminal; connected through wire 22 with thepeln 11', the other leg 23 of the metallic circultjhavii'ig connection from the frame 2 of the transmitter -(with' w'hich all the 'wheels l l, 12 and 13 have electrical con nectiori) to the ground at fthe central station. Each leg 'of circuit'22, 23, includes a relay 24, "the:armatnre24gfof which normally closes a circuit 25uinc1uding a signal register 26"andfa"source of current supply 27.- A back contact is provided forthe armature24; andia switch 28, is arranged to throw theljsaid fback c'ontact into the circuit when ne'cessaryQ It will, of course, be understood thatthe two relays ;may be associated ina single instrumentals is common practice. At the centralstation there; also provided a switch29 in thejciicuit leg 23, arranged to brcak thenormal ground 'connec' t-ion of said leg a nd throw it into connection with the positive terminal of the generator 20, such c rcuit arrangement being commonly known 'in the art and usually spoken of as 'a McCullough circuit. Also in accordance 'with customary practice the pen 12"-ha's' ground comicc'tion, asindicated acct), H

The circuit thus far described and wheels 11 and -12 operatefin"signaling 'in the usual manner, there being; i'ioriually a constantly energized metalliccircuit from the generator 2'0 bywire'22', pen 11" and wheel 11, frame.

wire 23,"switch 29ground and'wire 21 back to the generatorf so that both relays 2t are normally energized, the wheel 11 being an interru'jitcrfor suchmet'allic circuit. If anoutside lin' 2 r 23 be broken the-switch 29 is -thrown to connect the wire 23 to the positive pole tl'lel generator, and-switches 28 aremove d tocon-nect with the back contact wires. Under such conditions the wheel 12 and ground connections 3Q are relied 'switchj34 arranged to close either circuit branch 33 or 33- whilegopening theother. Beyond the'last registry station, or switch 34, the parallel circuits 33, 33' are connected and wire 35 is run in suitable manner to establish a signaling circuit for wheel 13 and one or more of the central station registers, such connection int-he installation under consideration being made to ground by connection thereof with the signaling pen 12. If desired the fastenings on doors and windows may'li'ave circuit closersincluded in the'wire 35, as shown at 35.

In the operation of the system as described, assumingthe parts to stand in the relation shown in Fig. 1, the selective-switch controlling'cam 15 stands in such position that thecircuit 33 is serving the signal wheel l3, and the watchman in his round has thrown all of t-he switches 34 for inclus on in said t zircuit'33'. Now when the watchman inserts'his keytin thebo'x'and turns the key to rotate the segment 5, the box is over- 10o wound, as before described, and trip-arm 7 lifts-the'stop-leycr 8' releasing the box to run until it is'again "stoppedby the lever- 8 at the end of a round. In the common revolution of the wheels 11, 12 and 13, wheels 11 and 12 respectively break and ground the circuit, each causing a number signal as 'incheated by their teeth, for record on the registers 26, and then the teeth of wheel 13 successively close a signaling circuit from generator by wire 22, closed contacts 11 and 11, frame 2, wheel 13, pen 13, wire 32, se-

lective switch pens 16 and 17, supc1".*isory circuit 33 including the switches 34- and wires 35 and 30 to ground for return by 11b wire 21 to the generator, shunting out relay 2 1 in wire 23.- Consequently the number signal of wheel 13' is received on the relay inmain circuit wire 23 and the central station operators are notified" that the watchmans switches have'al-l been thrown to proper position. Immediately bet'orev the 'stoppinglof the box' the half rotation of selective switch-controllingcam 15 throws over the selective-switch pen 16 to bring the supervisory circuit 33 into relation to serve wheel -13, and such circuit branch is obviously open all of the switches Now before his next periodic operation of c the the-watchman must make his roun d.-1

to all the switches 34 and throw each over for inclusion in circuit 33 to condition said circuit for current flow. In the event that the watchman fails to throw any one of'the switches 3 tto proper position, it will be apparent that there will be one or morev breaks in the supervisory circuit 33 or 33, which has been brought into transmitterserving relation by the action of the auto matic circuit changing mechanism, and con sequently upon the periodic operation of the box, while the signals are received at central from wheels 11 and 12, the supplemental signal from wheel 13 is not received and the central oilice is thereby apprised of the fact that the watchman has missed one or more stations in his group. It will be obvious furthermore that the supplemental signals received from the wheel 13 are transboth lines to the positive side of the generator, the results are as follows: If line 22 be broken, the working of the transmitter wheel 12 sends a signal over circuit 20, 29,23, 2,

12, 12, 30, ground 21, 20, followed by signal from wheel 13 over circuit 20,29, 23, 2, 13 13., 32, 16', 17, 33, 35, 30, ground 21, 20. If line 23 be broken the wheel 12 signals over circuit 20 22, 11, 11, 2, 12,12, 30, 21, 20 fol1owed by signal from wheel 13 over circuit 20, 22, 11', 11, 2, 13, 13', 32, 16, 17, 33, 35, 30, ground 21, 20.

In connection with the transmitter here- 'tofore described, means are provided, preferably operable from any watchmans station, for releasing the transmitter for its full run-down, or complete operation, to transmit its number signal many times repeated, as a distinguishing true fire alarm, and to this end 'there may be employed, as indicated iii-Fig. 1, a pneumatic release system conve "mtly embodying a pressure responsive device 40, located in the transmitter casing and having connection with the motor restraining lever 8, said pressure responsive device having piping connections 41 with' pressurecreating devices 42 and 42 located atthe several watchmans stations. In the specific construction iilustratively shown, the pressure responsive device 40 is, a chamber closed on one side by an inwardly buckled diaphragm, which hasv connected therewith a stem 43, arranged when the diaphra gm is buckled outwardly to elevate the lever S, and hold it elevated so that the motor may completely run down.

The pressure creating devices may be of anydesired character, those herein shown for illustrative purposes being a small air pump 612 and an explosive. cartridge 42' both operatively associated with the piping system 41.. Obviously when pressure is created in the piping system 4:1 by the manual actuation'of a pressure creating device, it flexes the diaphragm outwardly and releases the clock. The pipe 41 may also be equipped with thermostatic heads 42" filled with a heat expansive fluid, or other automatic pres-- sure devices.

In Fig. 2 is shown a modified embodiment of the invention in which the watch signals are transmitted dver a metallic circuit rather than a ground connection. In such embodiment two wheels 11' and 13 are provided each having an insulated segmenton its periphery. The Wheel 11 has a set of teeth in position corresponding with the insulated segment of wheel 13, and wheel 13 hastwo sets of teeth,,one corresponding in position with the insulated segment of wheel 11 and the other corresponding with a stripped portion of wheel 11. The pen 11", in wire 22, makes normal contact with its anvil, which is connected with wire 23. The pen 13 for wheel 13 is normally raised from its anvil by the insulation segment of such wheel. Both wheels are grounded as at 30. The cam 15 and switches 16, 17, 17', circuits-33 and 33 and switches 34 are provided as described, but the supervisory wiring is as follows: Pen 16 is connected by wire 32 topen 13, the anvil whereof is connected by wire 36 to wire 22, and the terminals of supervisory branches 33, 33' are wired as at '35 to wire, 23.

In signaling under the conditions shown in Fig. 2, thewheels rotate in a clock-wise direction, so that. while the shunt 36-32, 33, 35 is broken at pen 13 the wheel 11 grounds and breaks the main circuit; then while the main circuit is broken at 11 the wheel 13* grounds and breaks the metallic circuit 22, 36,32, 33, 35", and then after the main circuit has beenreestablished during the last third of therevolution of the wheels, the wheel 13 again grounds and breaks the shunt, momentarily shunting out the relay in line wire 23 as each tooth makes 1 contact.

I If the watchman has failed to close all switches34=,'obviously shunt 36, 32, 33 (or 33') 35 is not closed, and while the insulated segment of wheel 11 is passing its pen, the register in line wire 23 makes only a long dash or rundown. The register for line 22 may record on the grounds and breaks of wheel 13, under these. conditions.

In Fig. 3 is shown a convenient adaptation of the invention to altelephone signaling cirtransmitter 64 '53, circuit 54 and lamps 55, and a switch 56 is arranged to connect the subscribers lines with either central veniently has a middle 59 in a local circuit 60 energized as by'battery 61. ,At the subscribers circuit 63 and, throughits upper contact, a

The normal central station C and. subscribe ers equipment described, are illustrated as typifying any desired or ordinary telephone apparatus. At the subscribefls station a separate signaling phone may be employed, the hook 62', transmitter 64: and' bell circuit 63 y be another station on a two party line. In the. wiring for supervisory service, however, a motor driven box is, employed, involving a grounded wheel 70 toothed for closing switch pens 71 bridged, across the lines 51.

52; and. involving also a cam wheell5controlling pens 16, 17, 17, the pen 16 being connected to telephone transmitter 64, and anvils 17, 17 having connections 33 and 38 respectively, controlled by switches 34 and connected together to. line 51. Byrthis arrangement the parallel supervisory wires 33 and 33 alternately serve thevoice transmitter 64, so that to use it the'watchman must have made his round and properly I conditioned the appropriate circuit 33 or 33 of the supervisory service for current passage. hen he turns in hisreport at the end of a round, transmitter Tgrounds the line, causing current to flow from battery 50' over v either lim wire, by switch 71 and wheel 70' to, ground and back through the ground wire 57 including relay 58, so that his signal is recorded, but the watchman maybe required to vocally O. K. his signal, so that if he has failed to properly position all switches 34 he can not transmit his vocal;

signal.

It willbe seen that in each embodiment of the invention the arrangement is'such that closure of all switches 34 isjnecessary to establish a signaling circuit for a suitable transmitter, and automatic means are provided -for conditioning said circuit to re quire resetting'of the switches toestablish such circtn't for each successive. operation of battery bridged beswitchboard. Atthe alarm switchboard the battery 50 congrbund connection- -57 through a' relay 5.8 controlling a register station a switc'lr ,hoolt 62 connected with wire 52 controls through its lower contact a bridging bell v difi'ering widely connected'to theline wire 51.

being connected generally as would the transmitter, and it'urther,"that each embodiment 1s'1n a form provid ng alternative closable by theswi-tches, and automatic selectivev switch devices for temporarily imposing theservice of such transmitter upon first one and then the other-of said circuits. It will be understood,however,that the several embodiments areshown, not with a view to indicating-limits of thevariations which may be-made .in practically applying the invention, but merely to indicate the" adaptability of the invention to, different conditionsof service, and it will be'understood by those skilled in the art that the invention may be embodied in circuits and apparatus described.

Having thus described our-invention, what we claim is: I

1, In a signaling system, the combination of aline connecting a central station and a subscribers station to be rotected, a manually operable code-signai transmitter ,operatively associated with the line at the subscribers station, a supervisory circuit connection for said transmitter local tothe-area to be protected, means at intervals throughout-said supervisory circuit for manually closing the same, transmitter for .conditioning the supervisory Icircuit 'for the transmitter to require resetting of the closing means to establish a signaling circuit for the next operation of the transmitter, and at the central station an electro-responsiv'e signal 1 ceiving device.

2. The combination of a manually oper able circuit-breaking signal transmitter, a

line, a signal, receiving instrument in the line remote from the transm tter, a supervisory circuit local to the area to be supervised for'inclusion with the line and signaling instruments in a signaling circuit, switches in the supervisory circuit manually operable to close-breaks in the same, and means, automatically operable by the signal. transmitting mechanism, for conditioning from the forms shown and means operable by thebranches I in such signaling circuit, either the supervisory circuit to'require resetting of the switches to establish a signaling circuit 'forthe next-signaling operation of the transmitter.

3'. A signaling system comprising in combination motor-driven electric-impulse sig nal transmitting means, alternative signaling circuits therefor including in common a line and an electro-responsive signal receiver remote from the transmitter, switches arranged forin'clusion of either 'of' said signaling circuits, and selective means operable by the transmitter, for connecting either circuit to.serve';.the transmitter.

- 4.111 a signaling system, a line, electroresponsive signal-receiving means at one point n the line, and at a'relatively remote cuit tothe exclusion of the other, and auto maticmeans, operable by the transmitter,

for actuatingsaid switch to change the signaling circuit tion.

6. In a signaling system, a line, electro responsivesignal-receiving means. in the line, and at a relatively remotepoint a circuitbreaking transmitter to which said signalreceiving means is responsive including a moving part, two supervisory circuitbranches for inclusion with the-transmitter,

line, and receiver in a signaling circuit,

means operated by said movable part of the Y a transmitter alternately to include one of-said supervisory circuit-branches in the signal circuit to the exclusion of the other, and switches common to said supervisory circuitbranches to complete either supervisory cir-, cuit-branch and open the other.

7. In a signaling system, a line, electroresponsive means therein, switches the-condition of which is to be recorded by said .,.e lectro';responsive means, two supervisory circuits normally incomplete and alterafter each transmitter actua- 40 natively completable by throwing all of said switches, and a switch associated with both said supervisory circuits alternately to con.-

nect one thereof to the line to the exclusion of the other. 4 I

8. In a signaling system, a line, electroresponsive signal-receiving means therein, switches condition ofwhich is to be recorded by said electro-responsive means, two supervisory circuits normally incomplete and alternatively completable by throwing of allf'ofsaid switches, a signal transmitter in said line, operable through a signaling circuit including a complete supervisory cir cuit to cause response of said signal-receiv- 51mg means. and means operable upon actu ation of the transmitter alternately to exclude the completed supervisory circuit from, and include the other supervisory circuit in, the line with the transmitter and 5 receiver, whereby subsequent throwing of all the switches may complete a signaling circuit.

9. In a signaling system, a line, electroresponsive signaling means therein, switches throwing ofwhich is to be recorded by said cuit-breaker, switches in ."said supervisory operating caiii, a switch actuated by said cani of the transmitter after each signaling operation alternately to exclude one supervisory circuit from, and'include the other supervisory circuit in, a signaling circuit with said transmitter and signal-receiving means, whereby signal transmission after an actuation of said transmitter requires rethrowing of all of said switches.

10. In a signaling system,the combination of a central station signal-responsive device,

v line connections therefrom to a subscribers station, a signal transmitting box at the 35 subscribers station providing two circuitbreakers and operating means therefor, supervisory circuit, connections forcoinpleting a signaling circuit through one said circircuit connections settable to close the said supervisory connections, means operable by the transmitter to necessitate resetting ot' said switches after each signaling 0 eration, and connections to complete a signa ing circuit for the other circuit breaker independ- 'ently of said supervisory circuit connections.

11. In a signaling system, the combination of a central station receiving instrumentality, a subscribers station transmitter comprising two circuit breakers and operating means therefor; connections, including a line, to establish a signaling circuit for one said circuit breaker, to the exclusion of the 1 other; connections including supervisory circuit connections and said line tor estab-.

lishing a signaling circuit for the other circuit breaker, said supervisory circuit comprising two branches; means operable by the transmitter to connect said branches alternately to serve the appropriate circuit breaker: and switches alternatively operable to complete either supervisory circuit branch to the exclusion of the other brancl'i.

12. In a signaling systcm. a transmitter having a plurality of signaling wheels, signaling circuits therefor, the signaling circuit for one wheel comprising two supervisory branches, and the circuit for another wheel excluding said supervisory branches, means for connecting either of said supervisory branches to serve said transmitter wheel to the exclusion of the other branch, and a plurality of switches for closing either branch and opening the other.

13. In a signaling system. a mechanical signal transmitting box, comprising a signal wheel, a switch operating means. and a motor arranged to drive said wheel and switch operatingmeans, a signaling circuit for a wheel comprising parallel branches, a-

brnneh While 0)enin :1 a) in the other switch aetnuted by said operating means of hands. the transmitter for alternately connecting said branches to serve the signal wheel, and I manual switches in said circuit branches, each arranged to close a gap in either circuit JAMES G. N'OLEN;

JOHN ELDEN SHEPHERD.

In the presence 0f- GEO. T. MAY, J12

thereof. MARY F. ALLEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1). c.

' In testimony whereof weherennto set our 

